117 research outputs found
Barbe
Les chevaux de lâAfrique du Nord, connus sous le nom gĂ©nĂ©rique de chevaux barbes, sont considĂ©rĂ©s par les anciens hippiatres, dĂšs le xviie siĂšcle, comme constituant une race dĂ©terminĂ©e et dĂ©jĂ en 1733 La GuĂ©riniĂšre, Ă©numĂ©rant les races de chevaux de diffĂ©rents pays, note les qualitĂ©s du cheval barbe et le considĂšre comme meilleur Ă©talon que le cheval andalou. Le nom de « barbe » qui a Ă©tĂ© donnĂ© par les EuropĂ©ens aux chevaux de lâAfrique du Nord, dĂ©rive du nom des « Ătats Barbaresques », ce qu..
Ăglise
Toponymie Le mot latin qui dĂ©signe lâĂ©glise a laissĂ© une postĂ©ritĂ© dans la toponymie actuelle du Maghreb, Ă la fois dans les rĂ©gions berbĂ©rophones et dans celles oĂč lâarabisation a recouvert les dĂ©nominations antiques. Pour les premiĂšres, câest bien Ă ecclesia quâil faut rapporter les noms de lieux comme Henchir Tagliz, Henchir Taglissi en Tripolitaine, Henchir Tarlist auprĂšs de Zraia ou Taglisiya dans le royaume rostĂ©mide, en AlgĂ©rie centrale et occidentale. Il nâest pas impossible que le to..
Cillium
La ville antique de Cillium (Kasserine, Tunisie) se trouve dans la Haute Steppe, Ă une altitude dâenviron 600 mĂštres. Elle est entourĂ©e de djebels interrompus par la trouĂ©e de Kasserine, cĂ©lĂšbre par les combats de 1943. La sĂ©cheresse du climat (320 m/m dâeau par an) nâa longtemps permis Ă la rĂ©gion quâune Ă©conomie pastorale accompagnĂ©e de quelques cultures vivriĂšres, du moins avant la conversion liĂ©e au dĂ©veloppement de lâolĂ©iculture au dĂ©but de notre Ăšre dâabord, puis au dĂ©but de ce siĂšcle. ..
On the Bohr inequality
The Bohr inequality, first introduced by Harald Bohr in 1914, deals with
finding the largest radius , , such that holds whenever in the unit disk
of the complex plane. The exact value of this largest radius,
known as the \emph{Bohr radius}, has been established to be This paper
surveys recent advances and generalizations on the Bohr inequality. It
discusses the Bohr radius for certain power series in as well as
for analytic functions from into particular domains. These domains
include the punctured unit disk, the exterior of the closed unit disk, and
concave wedge-domains. The analogous Bohr radius is also studied for harmonic
and starlike logharmonic mappings in The Bohr phenomenon which is
described in terms of the Euclidean distance is further investigated using the
spherical chordal metric and the hyperbolic metric. The exposition concludes
with a discussion on the -dimensional Bohr radius
Super-heavy fermion material as metallic refrigerant for adiabatic demagnetization cooling
Low-temperature refrigeration is of crucial importance in fundamental
research of condensed matter physics, as the investigations of fascinating
quantum phenomena, such as superconductivity, superfluidity and quantum
criticality, often require refrigeration down to very low temperatures.
Currently, cryogenic refrigerators with He gas are widely used for cooling
below 1 Kelvin. However, usage of the gas is being increasingly difficult due
to the current world-wide shortage. Therefore, it is important to consider
alternative methods of refrigeration. Here, we show that a new type of
refrigerant, super-heavy electron metal, YbCoZn, can be used for
adiabatic demagnetization refrigeration, which does not require 3He gas. A
number of advantages includes much better metallic thermal conductivity
compared to the conventional insulating refrigerants. We also demonstrate that
the cooling performance is optimized in YbScCoZn by
partial Sc substitution with 0.19. The substitution induces chemical
pressure which drives the materials close to a zero-field quantum critical
point. This leads to an additional enhancement of the magnetocaloric effect in
low fields and low temperatures enabling final temperatures well below 100 mK.
Such performance has up to now been restricted to insulators. Since nearly a
century the same principle of using local magnetic moments has been applied for
adiabatic demagnetization cooling. This study opens new possibilities of using
itinerant magnetic moments for the cryogen-free refrigeration
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